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Fix libunwind build: Define __LITTLE_ENDIAN__ for LE targets #65972

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Merged
merged 1 commit into from
Nov 1, 2019
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Fix libunwind build: Define __LITTLE_ENDIAN__ for LE targets #65972

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6 changes: 6 additions & 0 deletions src/libunwind/build.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -56,12 +56,18 @@ mod llvm_libunwind {
pub fn compile() {
let target_env = env::var("CARGO_CFG_TARGET_ENV").unwrap();
let target_vendor = env::var("CARGO_CFG_TARGET_VENDOR").unwrap();
let target_endian_little = env::var("CARGO_CFG_TARGET_ENDIAN").unwrap() != "big";
let cfg = &mut cc::Build::new();

cfg.cpp(true);
cfg.cpp_set_stdlib(None);
cfg.warnings(false);

// libunwind expects a __LITTLE_ENDIAN__ macro to be set for LE archs, cf. #65765
if target_endian_little {
cfg.define("__LITTLE_ENDIAN__", Some("1"));
}

if target_env == "msvc" {
// Don't pull in extra libraries on MSVC
cfg.flag("/Zl");
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